I have a wp-based website for an online shop. The items are listed as posts, the navigation is based on categories. To display thumbnails of the items in the category pages, I have used the_excerpt_rss() in archive.php and put thumbnails in the excerpts field of each post. It works beautifully, but I also would like to limit the number of thumbnails appearing on the category pages and have a "next" link to other pages if more items exist for that category.
Is there some kind of plugin that exists for that purpose? I looked into NextGen Gallery, but there seems to be way too much steps involved for the user when adding a new post item. Did I go the wrong path by using RSS links instead of, say attaching thumbnails to individual posts and having those appear in the archive.php page?